Anthony Badalamenti faces a maximum sentence of a year in prison and a $100,000 fine after his guilty plea in US district court

BP oil spill: Badalamenti is accused of instructing a program manager to delete the results of simulations on centralizers, which could have supported BP's decision to use six instead of 21 centralizers. Photo: Ted Jackson/AP

A former Halliburton manager pleaded guilty Tuesday to destroying evidence in the aftermath of the deadly rig explosion that spawned BP's massive 2010 oil spill in the Gulf of Mexico.

Anthony Badalamenti, 62, of Katy, Texas, faces a maximum sentence of a year in prison and a $100,000 fine after his guilty plea in US district court to one misdemeanor count of destruction of evidence. His sentencing by US district judge Jay Zainey is set for 21 January.

Badalamenti was the cementing technology director for Halliburton Energy Services Group, BP's cement contractor on the Deepwater Horizon drilling rig. Prosecutors said he instructed two Halliburton employees to delete data during a post-spill review of the cement job on BP's blown-out Macondo well.

Last month, a federal judge accepted a separate plea agreement calling for Halliburton to pay a $200,000 fine for a misdemeanor stemming from Badalamenti's conduct. Halliburton also agreed to be on probation for three years and to make a $55m contribution to the National Fish and Wildlife Foundation, but that payment was not a condition of the deal.

The 20 April 2010 rig explosion killed 11 workers and led to the nation's worst offshore oil spill.

In May 2010, according to prosecutors, Badalamenti directed a senior program manager to run computer simulations on centralizers, which are used to keep the casing centered in the wellbore. The results indicated there was little difference between using six or 21 centralizers. The data could have supported BP's decision to use the lower number.

Badalamenti is accused of instructing the program manager to delete the results. The program manager "felt uncomfortable" about the instruction but complied, according to prosecutors.

A different Halliburton employee also deleted data from a separate round of simulations at the direction of Badalamenti, who was acting without company authorization, prosecutors said.

Halliburton notified investigators from a Justice Department task force about the deletion of data. Efforts to recover the data weren't successful.

Badalamenti wasn't the first individual charged with a crime stemming from the Deepwater Horizon disaster, but he is the first to plead guilty.

BP well site leaders Robert Kaluza and Donald Vidrine await a trial next year on manslaughter charges stemming from the rig workers' deaths. They botched a key safety test and disregarded abnormally high pressure readings that were glaring signs of trouble before the well blowout, prosecutors say.

Former BP executive David Rainey is charged with concealing information from Congress about the amount of oil that was spewing from the blown-out well in 2010. Former BP engineer Kurt Mix is charged with deleting text messages and voicemails about the company's response to the spill.

Two floors down from the courtroom where Badalamenti pleaded guilty, US district judge Carl Barbier is presiding over a trial for spill-related civil litigation. For the trial's second phase, Barbier is hearing dueling estimates from experts for BP and the federal government about the amount of oil that spewed into the Gulf.